Livedoid vasculopathy (LV) is an uncommon thrombotic dermal vasculopathy that is characterized by excruciating, recurrent ulcers on the lower limbs. Livedo racemosa, along with painful ulceration in the distal regions of the lower extremities, is the characteristic clinical appearance. It heals to form porcelain-white, atrophic scars, also known as Atrophie blanche. Livedoid vasculopathy has been linked to various conditions that can induce hypercoagulability, including neoplasms, autoimmune connective-tissue diseases, and inherited and acquired thrombophilias. The history, clinical findings, and histopathological analysis are combined to make the diagnosis. Prompt and suitable intervention mitigates discomfort and averts the formation of wounds and additional complications. In addition to general supportive measures, anticoagulants and antiplatelet medications can be considered the first-line treatments.
Signs and symptoms Recurrent focal non-inflammatory thrombosis of the superior superficial and medium dermal venulae, particularly on the lower extremities, bilaterally, is the initial clinical manifestation; upper extremity involvement has also been documented. Livedo racemosa or, less commonly, livedo reticularis are symptoms of such thrombosis, which causes blood and pressure to build up in the dermal superficial veins. The oxygen partial pressure in the skin decreases as a result of the blood flow obstruction, triggering a cutaneous response that presents as pruritus with itchy papules and erythematous-violaceous, purpuric plaques. They quickly develop into bleeding vesicles, or bullae, which, when they burst, produce painful, small ulcers about 5 mm in diameter. These ulcers eventually combine to form painful, confluent, reticulate, and geometric ulcerations.
Complications Due to the tissue exposure, the primary acute complications are pain and secondary infection. Atrophic scars, persistent hyperpigmentation, mononeuritis multiplex from vasa nervorum thrombosis, and cutaneous hemosiderosis in the lower limbs from erythrocytes oozing from the high-pressure regimen veins due to hemosiderin deposits in the skin are among the chronic complications associated with livedoid vasculopathy.
Causes Few things are known about the origins of dermal vessel thrombosis in livedoid vasculopathy, what sets off its initial episodes and relapses, and why it primarily affects the lower limbs.
Risk factors Livedoid vasculopathy has been linked to rheumatoid arthritis, systemic lupus erythematosus, scleroderma, polyarteritis nodosa, mixed and undifferentiated connective tissue diseases, and Sjogren's syndrome. Individuals with systemic lupus erythematosus who also have antiphospholipid antibody syndrome are more vulnerable. Patients with hematological or solid organ cancers may also experience livedoid vasculopathy. Livedoid vasculopathy may deteriorate during pregnancy, particularly in the third trimester, though fetal compromise has not been documented. Still, a sizable fraction of cases are idiopathic.
Genetics Livedoid vasculopathy is caused by a number of inherited and acquired coagulation abnormalities, such as polymorphisms in factor V, plasminogen activator inhibitor-1 (PAI-1), prothrombin, and methylenetetrahydrofolate reductase (MTHFR).
Mechanism At this point, the pathomechanism of livedoid vasculopathy is not fully understood. At first, livedoid vasculopathy was thought to be vasculitis. Presently, livedoid vasculopathy is understood to be a vascular illness in which procoagulatory factors predominate, resulting in hypercoagulability. Defects in endothelial dysfunction, such as reduced plasminogen activation, platelet dysfunction, or increased or restricted fibrin formation or lysis, may be the cause of the thrombotic effect. As a diffusion barrier, fibrin deposition and thrombus formation cause a reduction in oxygen availability, which causes necrosis. Furthermore, insufficient tissue perfusion results in inadequate wound healing, creating a vicious cycle. The so-called Virchow trias, hypercoagulability, stasis, and endothelial damage, also serve as risk factors for livedoid vasculopathy microvascular thrombosis. The manifestation of livedoid vasculopathy on the lower extremities is thought to be caused by variations in temperature and perfusion pressure, as well as a lower concentration of thrombolytic factors.
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